However, for a basic merge ie.
MERGE INTO archive ar
USING (SELECT activity, description FROM activities) ac ON (ar.activity = ac.activity) WHEN MATCHED THEN UPDATE SET description = ac.description WHEN NOT MATCHED THEN INSERT (activity, description) VALUES(ac.activity, ac.description)

I don't really see any benefits over CPYF MBROPT(*UPDADD) FMT(*MAPDROP).
Other than perhaps the ability to use commitment control with merge.

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